From: Ilia Alshanetsky <iliaa@php.net>
Date: Thu, 19 Apr 2007 22:49:11 +0000 (+0000)
Subject: MFB:  Fixed bug #41067 (json_encode() problem with UTF-16 input).
X-Git-Tag: RELEASE_1_2_0~267
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=68a31e78d33e501b41502bf73e708f1cdf5fcb79;p=php

MFB:  Fixed bug #41067 (json_encode() problem with UTF-16 input).
---

diff --git a/ext/json/JSON_parser.c b/ext/json/JSON_parser.c
index 4b88b9fbd5..fdd861152b 100644
--- a/ext/json/JSON_parser.c
+++ b/ext/json/JSON_parser.c
@@ -316,6 +316,25 @@ static void utf16_to_utf8(smart_str *buf, unsigned short utf16)
         smart_str_appendc(buf, 0xc0 | (utf16 >> 6));
         smart_str_appendc(buf, 0x80 | (utf16 & 0x3f));
     }
+    else if ((utf16 & 0xfc00) == 0xdc00
+                && buf->len >= 3
+                && ((unsigned char) buf->c[buf->len - 3]) == 0xed
+                && ((unsigned char) buf->c[buf->len - 2] & 0xf0) == 0xa0
+                && ((unsigned char) buf->c[buf->len - 1] & 0xc0) == 0x80)
+    {
+        /* found surrogate pair */
+        unsigned long utf32;
+
+        utf32 = (((buf->c[buf->len - 2] & 0xf) << 16)
+                    | ((buf->c[buf->len - 1] & 0x3f) << 10)
+                    | (utf16 & 0x3ff)) + 0x10000;
+        buf->len -= 3;
+
+        smart_str_appendc(buf, 0xf0 | (utf32 >> 18));
+        smart_str_appendc(buf, 0x80 | ((utf32 >> 12) & 0x3f));
+        smart_str_appendc(buf, 0x80 | ((utf32 >> 6) & 0x3f));
+        smart_str_appendc(buf, 0x80 | (utf32 & 0x3f));
+    }
     else
     {
         smart_str_appendc(buf, 0xe0 | (utf16 >> 12));